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- NPI Number
- 1477623403
- Provider Type
- Individual Practitioner
- Credential
- M.D.
- Primary Specialty
- Internal Medicine - Rheumatology
- License Number
- GFE25647
- Practice Address
- 451 E. Health Sciences Drive, Suite 6510
- City, State ZIP
- Davis, CA 95616
- Phone
- (530) 752-2884
- Last Updated
- June 8, 2026
- Source
- Publicly available data
James Castles, M.D. is a internal medicine - rheumatology provider located in Davis, CA. They offer internal medicine - rheumatology services to patients in the Davis area.
As a internal medicine - rheumatology provider in Davis, this clinician evaluates and treats patients for a range of common conditions seen in Davis and throughout CA.
The practice is located at 451 E. Health Sciences Drive, Suite 6510, Davis, CA 95616. Patients can call 5307522884 to schedule an appointment or use the directions link above to find the office from anywhere in the area.
Patients typically visit this provider for patients see internists for annual physicals, management of chronic conditions such as diabetes, hypertension, and heart disease, second opinions, and coordination of care between specialists.
If you plan to see this provider, it is a good idea to confirm that the practice accepts your insurance and is in-network before scheduling. Coverage details vary by plan, and our quote tool can help you compare options in CA.
This profile was last verified on June 8, 2026. Provider information is sourced from publicly available data and may not reflect recent changes. Please confirm details directly with the practice before scheduling.
James Castles, M.D.
451 E. Health Sciences Drive, Suite 6510, Davis, CA 95616
Call for hours and appointments. Hours may vary by provider and location.
A patient’s guide to internal medicine - rheumatology care in Davis, CA.
What a Internal Medicine - Rheumatology provider does
Internal medicine providers, also called internists, specialize in the prevention, diagnosis, and treatment of diseases in adults. They are trained to handle both common and complex illnesses and often manage patients with multiple chronic conditions.
Common conditions treated
Internists commonly treat hypertension, type 2 diabetes, coronary artery disease, chronic obstructive pulmonary disease (COPD), thyroid disorders, kidney disease, and arthritis. They also coordinate cancer screenings and geriatric assessments.
Common reasons to schedule a visit
Patients see internists for annual physicals, management of chronic conditions such as diabetes, hypertension, and heart disease, second opinions, and coordination of care between specialists.
What to expect during a visit
Expect a thorough review of your medical history, current medications, and lifestyle. Your internist may order blood work, imaging, or other diagnostic tests to support an accurate diagnosis and treatment plan.
Insurance coverage considerations
Medicare and most commercial insurance plans cover adult preventive visits and chronic care management. Verify network status before scheduling by using our quote tool.
How to choose the right internal medicine - rheumatology provider in Davis
Choose an internist with experience managing your specific conditions, convenient hospital affiliations, and a willingness to coordinate with any specialists you may need. Board certification in internal medicine signals additional training and commitment to ongoing education.
Looking for in-network coverage that includes this internal medicine - rheumatology provider? Compare health plans in CA →
Insurance acceptance not listed
The public NPI registry does not include insurance acceptance data. Contact the office directly to ask if they accept your insurance plan. You can also use our quote tool to find health plans in CA.
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Common questions about James Castles, M.D. in Davis, CA.
How do I make an appointment with James Castles, M.D.?
Call James Castles, M.D. directly at their Davis office to schedule a visit. You can also use the contact form on this page to send a message and the practice will respond.
Does James Castles, M.D. accept insurance?
Provider insurance information is not included in the public NPI registry data that powers this directory. Contact the office directly to ask whether they accept your specific insurance plan. You can also use our quote tool to find health plans in CA.
What are the office hours for James Castles, M.D. in Davis?
Office hours for James Castles, M.D. in Davis are not currently published. Call the practice directly to confirm hours before your visit.
Is parking available at James Castles, M.D.'s Davis location?
Most provider offices in Davis offer on-site or nearby street parking. Call James Castles, M.D. in Davis ahead of time to confirm parking options and accessibility accommodations.
Does James Castles, M.D. offer telehealth?
Many internal medicine - rheumatology providers in CA now offer telehealth visits for follow-ups, medication management, and routine consultations. Call James Castles, M.D. to ask whether a telehealth visit is appropriate for your needs.
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Claim ProfileData is sourced from publicly available records. Public records do not confirm active license status, quality of care, insurance acceptance, or network participation. Please verify details directly with the provider before scheduling. Last updated June 8, 2026.